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Angies List does not have a category for this - Stereo and Home Theater Systems is the closest they come - but in yur area should not be too tough to find a contractor because of all the government buildings using sound isolation. Local university music departments mihgt be able to give you some names too.

You need a specialty soundproofing and studio contstruction company, depending on how soundproof you want it. Sometimes moveable baffle walls around the practice area and sound-dampening carpet and sound-deadening draperies over windows and doors under will take care of it (if no overhead habitation), at the other extreme you have the totally independent HVAC system, isolated concrete slabs (cut through to isolate them to prevent sound transmission), built-up sound absorbing flooring, multiple layers of sound-deadening walls up to a foot thick or more with special layering and ceilings, heavy sound deadening draperies, etc. for recording studios.

It also matters a lot on whether you are trying to keep your sound from disturbing neighbors, or keeping outside sounds out. The latter is easier for practice room purposes, but tougher if looking at a full-fledged recording studio.

Cost can be all over the place - commonly $1000-5000 range for totally in-room sound control measures, into the $10,000 or more if taking active measures with in-wall reflector and sound-absorbing layers, on up to $50,000 - 250,000 range for a single-room recording studio (not including any recording equipment) with true room isolation (which is commonly 3 rings of separate walls, floors, and ceilings with air gaps in between). And of course can go up due to adding echo chambers, reverb chambers, separate instrument isolation areas (for simultaneous multi-track recording), etc too. Worked on a few high-end such studios (private, commercial, and network) in my younger days because a family member was in the recording and studio building business - it takes a LOT of bucks and time to do it right for a true higher-end professional quality studio. For just a practice room to keep your sound to acceptable levels for neighbors - commonly under $10,000 will handle it except for drums, which are a problem in themselves.

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